The federal government oversees the process of having a donation declared an ecological gift, and there are regulations and criteria regarding how a property qualifies. https://www.canada.ca/en/environment-climate-change/services/environmental-funding/ecological-gifts-program/assessing-sensitivity.html
Not only properties can be donated. One can also donate easements and covenanted areas. The donated parcel only needs to meet one of the criterion on the list, although most of them will meet more than one.
According to the federal government, an ecological gift can provide significant tax advantages to the donor and can ensure that a land's biodiversity and environmental value is protected into the future.
For more information, go to the Environment Canada Eco Gifts page: http://www.ec.gc.ca/pde-egp/default.asp?lang=En&n=FCD2A728-1.
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